Universal Compatibility: Convenient for you to detect your doors, windows, cabinets, drawers, or anywhere you want to notified when it is opened or closed. Alarm Push: When you leave home, it will push notification messages to you when the door/window opens or closes, so you can discover the intruder in time. Easy Install: No complicated installation tools are required. The sensor can be installed with double-sided adhesive tape. Wifi Connect: By connecting WIFI (2.4G only) and mobile phone connection, and download an app tuya to detect the status of your door/window. Long Standby Time: Long standby time, powered by 2 AAA batteries for power supply (not included), of which standby time lasts for about 8-12 months. Low Battery Remind: When the battery power is low, the user will be prompted to replace the battery in time through the APP push. Specifications: Material: ABS Color: White Size(L x W x H): About 72 x 30 x 19mm/2.8 x 1 x 0.7inch, 45.5 x 14 x 15.5mm/1.79 x 0.55 x 0.6inch Powered by: 2pcs x AAA Batteries(not included) Work environment: 0 - 50 Degrees Celsius What's in the box 1 x Tuya Smart WiFi Door Sensor set